Building regulations now in force

Transcription

1 BCA Section J: Guide to compliance Publication date July 2008

2 Building regulations now in force BCA SECTION J: Mandatory energy efficiency measures for non-residential construction The new BCA Section J, which came into force in 2006 will change the way we build. It sets new standards for long term insulation and environmental performance of components and construction methods. It is the responsibility of all involved in the construction industry to understand and comply with the new mandatory provisions of BCA Section J. This includes: designers specifiers engineers building contractors owners investors Section J covers all Class 2 to 9 buildings (residential and commercial buildings). It aims to reduce greenhouse gas emissions by increasing energy efficiency of structures. Affects all air conditioned and many non-air conditioned buildings. Specific areas of focus include: Loss of energy through heating/cooling leakage through building fabric roof, ceilings, walls and floors External glazing to reduce heat gain and place less pressure on air conditioning Sealing to reduce leakage around chimneys, flues, windows, doors and other projections Air movement and ventilation to reduce air conditioning needs Design of air conditioning systems to prevent excessive power consumption Section J regulations are different for each class of structure and climate zone in Australia. The building code of Australia Section J: Mandatory energy efficiency measures for non-residential construction The Building Code of Australia (BCA) Section J (mandatory energy efficiency measures for non-residential construction) regulation aims to reduce greenhouse gas emissions from buildings. This regulation has been developed in consultation with state, territory and local governments, building practitioners, industry and the community. State Australian Capital Territory Implementation dates Adoption date 1 May 2006 New South Wales 1 November 2006 Northern Territory 1 May 2006 Queensland 1 May 2006 South Australia 1 August 2006 Tasmania 1 May 2006 Victoria 1 May 2006 Western Australia 1 May 2006 Energy efficiency measures were initially introduced into the BCA housing provisions in In 2005, mandatory measures were introduced into the BCA for Class 2-4 buildings. This was followed up in 2006 with similar measures for Class 5-9 buildings. All of the BCA provisions are now mandatory for Class 2 to 9 buildings (refer to the appendix description for building classes). Buildings with HVAC are particularly affected by the new regulations. Greenhouse gas emissions The Australian government has committed to achieving specific greenhouse reductions as part of the Kyoto Protocol, which came into effect in Section J in building construction is a key project in the steps taken to achieve these emission targets. Compliance to Section J Automatic compliance to Section J mandatory regulations can be achieved by meeting the BCA prescribed building solutions, called Deemed to Satisfy provisions. There is provision for alternative engineered solutions, which will require documentary evidence, verification, comparative analysis or expert judgement. New energy efficiency measures The incorporation of energy efficiency measures in the BCA is targeted towards ongoing operational efficiencies over the life of buildings. The BCA sets standards for the performance of buildings, including services that aid the efficient use of energy. Section J incorporates the use of the building, the method of construction, its geographic location, the effects of nearby features such as landforms, structures and buildings, and solar radiation considerations. The mandatory energy efficiency requirements vary according to the Class of building and are also based on the climate zone. Australia is divided into geographical zones (see map, also available on the ABCB website). Different levels of energy efficiency are required, based on the climate severity for each building being designed.

3 Specific areas targeted by the BCA for improvement are: 1. Building fabric The building fabric the basic components of a building, including the roof, ceilings, walls and floors should have sufficient thermal resistance to ensure that energy is not lost by heat transmission. Roof, ceiling, walls and floors must achieve a specified total R value (which is the total sum of the insulating performance of all individual component layers, including any 2. building material, insulating material, airspace and associated surface resistances). External glazing There are regulations to ensure that the amount of heat gain through windows is not excessive and that air conditioning needed to counteract the heat losses through windows is not excessive. Shading of the building and glazing orientation are also factors that can affect heat loss or gain Building sealing Building sealing effectiveness can not only influence the size of air conditioning HVAC in building design, it can also influence longer term energy operating consumption. The BCA requires sealing around chimneys, flues, windows doors and other projections. The building fabric around roofs, walls and floors also needs to be constructed to minimise air leakage. Air movement Air movement within a building offers a form of cooling, so that air conditioning requirements can be reduced. Ventilation requirements vary by building class and climate zone. There are also restrictions on the fixing method and size for ceiling fans or evaporative coolers. Air conditioning and ventilation systems Air conditioning must be able to operate at different temperatures and times to meet the intended use of the building. The design of the HVAC system in terms of motor power and ventilation/exhaust must prevent excessive energy consumption. Artificial lighting and power The number of lights and power consumption are to be regulated to within acceptable maximum levels. Hot water supply Hot water systems must be designed and installed in accordance with Section 8 of AS/ANZ plumbing and drainage heated water services. Access for maintenance There are maintenance measures that must be provided to all plant, equipment and components that require maintenance, to ensure that they operate at efficient levels. Summary Section J energy efficiency measures are implemented through the local standard building approvals process, involving building inspectors and surveyors, and often independent building certifiers and assessors. Building designers and builders themselves need to be aware of these new requirements. The Section J implications for building construction are complex, and vary according to the class of building and also with the climate zone. From Kingspan s experience worldwide where similar regulations have been introduced, it has been the signal/catalyst for further regulations to be developed. Likely further developments include mandatory air leakage testing, regulations being extended across all classes of buildings, the requirement for thicker insulation, the implementation of elemental calculations and the anticipation of change of tenancy. For further information contact your state based ABCB office. Additional information can also be obtained from their website at

4 Typical insulation requirements for the building envelope under Section J Roofs and ceilings Climate zone 1 2a 2b Class 2 or 3 building, Class 4 part of building or Class 9c aged care building Total R Direction of heat flow Down Down and Up Up Class 5, 6, 7, 8, 9a or 9b building Total R Direction of heat flow Down Up Walls Climate zone 1 2a 2b Class 2 or 3 building, Class 4 part of building or Class 9c aged care building Total R Class 5, 6, 7, 8, 9a or 9b building Total R Where do conventional non-compliant systems sit under Section J? Typical R values achieved with conventional non-compliant roof construction Typical R values achieved with conventional non-compliant wall construction Construction method and materials Typical R value** Construction method and materials Typical R value** Metal deck, cavity, reflective foil, cavity, bulk insulation*, plasterboard 1.14 Concrete tilt-up panel (100mm), bulk insulation*, with furring channel and plasterboard finish 0.28 Metal deck, bulk insulation* with 0.77 reflective foil laminate, cavity, plasterboard These figures assume best practice installation and the absence of insulation voids * The value of the bulk insulation to be added to the typical R value. A typical R value for bulk insulation of 50mm would be R and may vary depending on the product selected ** Different levels of thermal performance can be achieved, based on summer or winter climatic conditions and the use of reflective foils. The minimum value (or winter condition) is the one that in general needs to meet the minimum BCA level of performance and is the value given here 110mm brick wall with internal stud frame and plaster lining Cement clad wall, reflective foil laminate, reflective cavity, bulk insulation*, plasterboard Double brick cavity wall, with furring channels and plasterboard

5 New concept insulated panels a compliance solution Thermal insulation thickness Kingspan insulated panels were developed for construction efficiency. They provide energy efficient solutions that are already compliant with BCA Section J and are widely used in markets where such regulations have long been in force. The external envelope must be procured under one package with a single point of responsibility for design detailing, supervision and installation, rather than as individual building elements. This is at the heart of the Kingspan concept. Minimum compliance requirements from May 2006 (November 2006 for NSW). Please note where light colours with high reflective values are used in certain climate zones there is a provision under Section J where the minimum thickness can be reduced from Kingspan 60mm to 40mm. Contact the Kingspan technical services for further information on KS1000 RW Core thickness (mm) R value (m 2 K/W) Weight kg/m 2 0.5/0.4 steel An airtight envelope Building with Kingspan insulated panels guarantees you an airtight envelope. The inherent thickness and structural rigidity of Kingspan insulated panels together with factory-engineered joints and robust details ensures minimal air leakage. Long term thermal performance Kingspan insulated roof and wall panels are guaranteed to retain their thermal performance for the life of the product thereby helping to ensure that the building energy performance rating is maintained throughout the life of the building. The easy way to become compliant The easy way to become compliant in all cases is to choose Kingspan as your guide to selecting building systems. Kingspan s range of roofing and wall panel systems already complies with Section J. You can spend precious time trying to understand it or you can call Kingspan for expert advice on References [1] Australian Building Codes Board, BCA 2006, Class 2 to 9 Buildings, Volume One, 2006 [2] Australian Greenhouse Office, Tracking to the Kyoto Target Australia s Greenhouse Emissions Trends 1990 to and 2020, 2006 Appendix: BCA building classifications used in nonresidential construction Class 4: Class 5: Class 6: Class 7a: A dwelling part of a building in Class 5, 6, 7, 8 or 9 Office buildings Shop or other buildings for the sale of goods, eg restaurant, barber s shop, laundry, market, showroom and service station Car parks Class 2: Two or more sole-occupancy Class 7b: Storage or display of goods Class 3: Boarding houses, guest houses, hostels, Class 8: Laboratories, production areas lodging-houses or backpackers accommodation. A residential part of a hotel, motel, school, a health care building or a detention centre. Buildings for the aged, children or disabilities Class 9a: Class 9b: A health-care building Assembly buildings, trade workshops, laboratories in schools accommodation Class 9c: Aged care buildings

6 Kingspan Insulated Panels Pty Limited Dunheved Circuit St Marys NSW 2760 Tel Fax Care has been taken to ensure that the contents of this publication are accurate, but Kingspan Insulated Panels Pty Limited and its subsidiary companies do not accept responsibility for errors or for information that is found to be misleading. Suggestions for, or descriptions of, the end use or application of products or methods of working are for information only and Kingspan Insulated Panels Pty Limited and its subsidiaries accept no liability in respect thereof. KING1545